ASME B17.1 Class 1 Machine Keys

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Length

Height

Key Type

Tolerance Rating

Material

1008-1045 Carbon Steel

1018-1045 Carbon Steel

Minimum Hardness

Specifications Met

Hardness

DFARS Specialty Metals

Exempt

RoHS

Compliant

Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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Finish

End Height

Head Height

Rate of Taper

Head Length

152 Products

Machine Keys

Straight keys, with a square or rectangular cross section, are the most common type of key. Install them in keyways to transmit torque from shafts to gears and other components. Machine keys are often the same material as the shaft and other components with which they are used. To use a key as a sacrificial part, choose a softer key that will shear off when parts are exposed to excessive force, preventing damage to expensive equipment.

1008-1045 Carbon Steel—Steel keys are strong and easy to machine. Since steel is the most common material, these keys work in many applications. Steel keys rust when exposed to moisture, so they should only be used in dry environments.

Zinc-Plated 1008-1045 Carbon Steel— Zinc-plated steel keys resist corrosion in wet environments.

Undersized Tolerance—Slightly smaller than the size listed in the table, undersized keys are the choice when you need a slightly looser fit or when you have an inconsistent keyway. Use them when parts need to be taken apart frequently, such as for maintenance or prototyping.

ASME B17.1 Class 1—Keys that meet ASME B17.1 specifications conform to ASME standards for dimensions and tolerances.

			Tolerance
	Lg.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel







				1/8" × 1/8"

				1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A090	000000


				1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A095	0000
				3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A100	0000
				1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A110	0000
				1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A115	0000
				1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A117	0000




						3/16" × 3/16"

						1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	98870A118	0000


						1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A120	0000
						3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A130	0000
						7/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	98870A135	0000
						1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A140	0000
						1 1/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	98870A145	0000
						1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A150	0000
						1 3/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A321	0000
						1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A160	0000
						1 3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A170	0000
						2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A180	0000


						2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A190	0000
						3"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	98870A192	0000
						4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	98870A193	00000




								1/4" × 1/4"

								1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	98870A194	00000


								3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A195	0000
								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A205	0000
								1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A215	0000
								1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A230	0000
								1 3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A240	0000
								2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A245	0000
								2 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A255	0000
								2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A260	0000
								3"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A265	0000
								3 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	98870A267	00000


								4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	98870A269	0000
								5"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	98870A271	00000




								5/16" × 5/16"

		1 1/4"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A275	0000


		1 1/2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A277	0000
		2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A281	00000
		2 1/2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A283	00000




								3/8" × 3/8"

								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	98870A285	0000


				1 1/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A287	0000
				1 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A288	00000
				1 3/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	98870A301	0000
				2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A289	00000
				2 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	98870A290	00000
				2 3/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A338	0000




								1/2" × 1/2"

								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	1	98870A341	0000


								1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A292	00000
								1 5/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A336	0000
								2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A293	00000
								2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A294	00000
								3"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	98870A296	00000
								3 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	98870A298	00000


						Zinc-Plated 1008-1045 Carbon Steel







										3/16" × 3/16"

										1 3/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	4732N11	00000

Rounded Machine Keys

When installed, these keys fill oval keyways completely, reducing stress on the key and shaft. Using them in a closed keyway keeps them from sliding along the shaft axis. The rounded ends make it easy to slide gears, hubs, and other components into place. These are also known as feather keys. Machine keys are often the same material as the shaft and other components with which they are used. To use a key as a sacrificial part, choose a softer key that will shear off when parts are exposed to excessive force, preventing damage to expensive equipment.

Zinc-Plated 1008-1045 Carbon Steel— Zinc-plated steel keys resist corrosion in wet environments.

Oversized Tolerance—Slightly larger than the size listed in the table, oversized keys fit tightly in a keyway. Press them into place for use in high-torque applications or to replace a key in a worn keyway.

ASME B17.1 Class 1—Keys that meet ASME B17.1 specifications conform to ASME standards for dimensions and tolerances.

			Tolerance
	Lg.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel







				1/8" × 1/8"

				1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A677	00000


				3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A975	0000
				1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A664	0000




						3/16" × 3/16"

						1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A696	0000


						3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A966	0000
						1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A326	0000
						1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A537	0000
						1 3/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A528	0000
						1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A179	00000
						2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A885	0000




								1/4" × 1/4"

								3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A933	0000


								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A641	0000
								1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A317	0000
								1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	98870A236	0000
								1 3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A558	0000
								2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A883	00000
								2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A820	00000




										3/8" × 3/8"

										1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A673	00000


										1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A557	00000
										1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A536	00000
										2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A891	00000
										2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A830	00000




												1/2" × 1/2"

												1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A629	00000


1 1/2"	Undersized											-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A522	00000
1 5/8"	Undersized											-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A627	00000
2"	Undersized											-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	98870A876	00000
3"	Undersized	-0.002" to 0.000"										-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	1	98870A917	0000
3 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"									Not Rated	ASME B17.1 Class 1	1	98870A912	0000


Zinc-Plated 1008-1045 Carbon Steel







				1/8" × 1/8"

				1/2"	Undersized							-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A108	0000


				3/4"	Undersized							-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A131	0000
				1"	Undersized							-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A135	0000




												3/16" × 3/16"

												1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A151	0000


						3/4"						Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A152	0000
						1"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A301	0000
						1 1/4"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A343	0000
						1 1/2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A366	0000
						1 3/4"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A467	0000
						2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A471	0000




												1/4" × 1/4"

												3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 1	5	95053A668	00000


								3/4"				Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A595	0000
								1"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A611	0000
								1 1/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A682	0000
								1 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A786	0000
								1 3/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A799	00000
								2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A840	00000
								2 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A937	00000




												3/8" × 3/8"

										1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A952	0000


										1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	95053A990	00000




												1/2" × 1/2"

												1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	1	95053A991	0000

Tapered Gib Keys

These keys have a tapered body that wedges in to the keyway for a more secure fit than standard machine keys. The gib head makes these keys easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping. Keys are tapered along their length. Use them to connect gears and other components with tapered keyways to shafts. Keys are made of steel.

Inch—The height of inch keys decreases by _1/8" for every 12" of length. They conform to ASME B17.1 Class 1 standards for dimensions and tolerances.

		Tolerance		Head
	Lg.	Ht.	Wd.	Ht.	Lg.	End Ht.	Rate of Taper	Specs. Met	System of Measurement		Each
1018-1045 Carbon Steel







				3/16" × 3/16"

				1 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/16"	9/32"	0.174"	1:96	ASME B17.1 Class 1	Inch	98471A117	00000


				2"	-0.002" to 0.000"	-0.002" to 0.000"	5/16"	9/32"	0.169"	1:96	ASME B17.1 Class 1	Inch	98471A118	0000
				3"	-0.002" to 0.000"	-0.002" to 0.000"	5/16"	9/32"	0.158"	1:96	ASME B17.1 Class 1	Inch	98471A120	0000




						1/4" × 1/4"

						1 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.237"	1:96	ASME B17.1 Class 1	Inch	98471A132	0000


						2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.232"	1:96	ASME B17.1 Class 1	Inch	98471A133	0000
						2 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.227"	1:96	ASME B17.1 Class 1	Inch	98471A134	0000
						3"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.221"	1:96	ASME B17.1 Class 1	Inch	98471A135	0000
						3 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.216"	1:96	ASME B17.1 Class 1	Inch	98471A136	0000
						4"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.211"	1:96	ASME B17.1 Class 1	Inch	98471A137	0000




								5/16" × 5/16"

								2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.295"	1:96	ASME B17.1 Class 1	Inch	98471A142	0000


								2 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.290"	1:96	ASME B17.1 Class 1	Inch	98471A143	0000
								3"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.285"	1:96	ASME B17.1 Class 1	Inch	98471A144	0000
								4"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.274"	1:96	ASME B17.1 Class 1	Inch	98471A146	0000




										3/8" × 3/8"

										1"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.368"	1:96	ASME B17.1 Class 1	Inch	98471A169	0000


										1 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.363"	1:96	ASME B17.1 Class 1	Inch	98471A171	0000
										2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.358"	1:96	ASME B17.1 Class 1	Inch	98471A172	0000
										2 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.353"	1:96	ASME B17.1 Class 1	Inch	98471A173	0000
										3"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.348"	1:96	ASME B17.1 Class 1	Inch	98471A174	0000
										3 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.342"	1:96	ASME B17.1 Class 1	Inch	98471A175	0000
										4"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.337"	1:96	ASME B17.1 Class 1	Inch	98471A176	0000
										4 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.332"	1:96	ASME B17.1 Class 1	Inch	98471A177	0000
										5"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.327"	1:96	ASME B17.1 Class 1	Inch	98471A178	0000




												7/16" × 7/16"

												4"	-0.002" to 0.000"	-0.002" to 0.000"	3/4"	9/16"	0.400"	1:96	ASME B17.1 Class 1	Inch	98471A192	0000


4 1/2"	-0.002" to 0.000"											-0.002" to 0.000"	3/4"	9/16"	0.395"	1:96	ASME B17.1 Class 1	Inch	98471A195	0000




		1/2" × 1/2"

		2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.484"	1:96	ASME B17.1 Class 1	Inch	98471A237	0000


		2 1/2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.479"	1:96	ASME B17.1 Class 1	Inch	98471A238	0000
		3"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.474"	1:96	ASME B17.1 Class 1	Inch	98471A239	0000
		3 1/2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.469"	1:96	ASME B17.1 Class 1	Inch	98471A240	0000
		4"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.464"	1:96	ASME B17.1 Class 1	Inch	98471A241	0000
		4 1/2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.458"	1:96	ASME B17.1 Class 1	Inch	98471A242	0000
		5"	-0.002" to 0.000"	-0.002" to 0.000"								3/4"	5/8"	0.453"	1:96	ASME B17.1 Class 1	Inch	98471A243	0000
		5 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	3/4"							5/8"	0.448"	1:96	ASME B17.1 Class 1	Inch	98471A244	0000
		6"	-0.002" to 0.000"	-0.002" to 0.000"	3/4"							5/8"	0.443"	1:96	ASME B17.1 Class 1	Inch	98471A245	0000




				5/8" × 5/8"

				3"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.600"	1:96	ASME B17.1 Class 1	Inch	98471A318	0000


				3 1/2"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.595"	1:96	ASME B17.1 Class 1	Inch	98471A319	0000
				4"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.590"	1:96	ASME B17.1 Class 1	Inch	98471A320	0000
				4 1/2"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.585"	1:96	ASME B17.1 Class 1	Inch	98471A321	00000
				5"	-0.004" to 0.000"	-0.004" to 0.000"						1"	3/4"	0.579"	1:96	ASME B17.1 Class 1	Inch	98471A322	00000
				5 1/2"	-0.004" to 0.000"	-0.004" to 0.000"	1"					3/4"	0.574"	1:96	ASME B17.1 Class 1	Inch	98471A323	00000
				6"	-0.004" to 0.000"	-0.004" to 0.000"	1"					3/4"	0.569"	1:96	ASME B17.1 Class 1	Inch	98471A324	00000




						3/4" × 3/4"

						4"	-0.004" to 0.000"					-0.004" to 0.000"	1 1/8"	7/8"	0.716"	1:96	ASME B17.1 Class 1	Inch	98471A360	00000


						4 1/2"	-0.004" to 0.000"					-0.004" to 0.000"	1 1/8"	7/8"	0.711"	1:96	ASME B17.1 Class 1	Inch	98471A361	00000
						5"	-0.004" to 0.000"	-0.004" to 0.000"				1 1/8"	7/8"	0.706"	1:96	ASME B17.1 Class 1	Inch	98471A362	00000
						5 1/2"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/8"			7/8"	0.701"	1:96	ASME B17.1 Class 1	Inch	98471A363	00000
						6"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/8"			7/8"	0.695"	1:96	ASME B17.1 Class 1	Inch	98471A364	00000




								7/8" × 7/8"

								4"	-0.004" to 0.000"			-0.004" to 0.000"	1 1/4"	1"	0.842"	1:96	ASME B17.1 Class 1	Inch	98471A404	00000


								5 1/2"	-0.004" to 0.000"			-0.004" to 0.000"	1 1/4"	1"	0.827"	1:96	ASME B17.1 Class 1	Inch	98471A407	00000
								6"	-0.004" to 0.000"			-0.004" to 0.000"	1 1/4"	1"	0.822"	1:96	ASME B17.1 Class 1	Inch	98471A408	00000




										1" × 1"

										5"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/2"	1 1/8"	0.958"	1:96	ASME B17.1 Class 1	Inch	98471A455	00000


										6"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/2"	1 1/8"	0.948"	1:96	ASME B17.1 Class 1	Inch	98471A457	00000

Machine Key Stock

Cut this square or rectangular key stock to length to create a straight machine key. Straight keys are the most common type of key. Machine keys are often the same material as the shaft and other components with which they are used. To use a key as a sacrificial part, choose a softer key that will shear off when parts are exposed to excessive force, preventing damage to expensive equipment.

Zinc-Plated 1008-1045 Carbon Steel

Zinc-plated 1008-1045 carbon steel key stock is an economical choice with good strength and resists corrosion in wet environments.

Undersized Tolerance—Slightly smaller than the size listed in the table, undersized stock is the choice when you need a slightly looser fit or when you have an inconsistent keyway. Use it when parts need to be taken apart frequently, such as for maintenance or prototyping.

			Tolerance
	Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met		Each
12" Long



		1" × 5/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	98491A842	000000